Free University of Berlin

Hi Himanshu,
Every country has stringent labor laws and with MS, the ideal work you may join is research or graduate assistant. The salary may range between 5 to 15 or more euros per hour and you may work up to 20 hours a week. For more clarity read this. Getting a job entirely depends on your skills and if you know German, it would be much easier.
https://studyabroad.shiksha.com/part-time-work-options-for-international-students-in-germany-articlepage-532

Hi Amit,
As for eligibility, you need to be a graduate in relevant subjects from a recognized university in India. You would need to write an IELTS exam and possible also a GRE as most universities require the same.
Also, since it is a rather niche course, I would recommend you to check whether it is offered in English or not. If not, you would also need to clear German Language Exams.
Here's a link to help you:
https://studyabroad.shiksha.com/mba-ms-from-germany-structure-eligibility-and-application-process-for-pg-courses-articlepage-382